

<template>
    <div class="star" :class="starType">
        <span v-for="(itemClass,index) in itemClasses" :class="itemClass" class="star-item"></span>
    </div>
</template>



<script>

const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';

export default {
    props: {
        size: {
            type: Number,
            default: 0
        },
        score: {
            type: Number,
            default: 0
        }
    },
    computed: {
        starType(){
            return 'star-' + this.size;
        },
        itemClasses(){
            let result = [];
            let score = Math.floor(this.score*2)/2;
            let hasDecimal = score % 1 !== 0;   //分数的小数部分
            let integer = Math.floor(score);    //分数的整数部分
            for(let i=0; i<integer; i++){
                result.push(CLS_ON);     //把整星放入到数组
            }
            if(hasDecimal){
                result.push(CLS_HALF);     //如果有半星，就把半星放入到数组
            }
            while(result.length < LENGTH){
                result.push(CLS_OFF);     //如果没有5颗星，就将暗星放进去
            }
            return result;
        }
    }
}

</script>



<style lang="stylus" rel="stylesheet/stylus" scoped>

    @import '~common/stylus/mixin.stylus';
    
    .star{
        font-size: 0;
        .star-item{
            display: inline-block;
            background-repeat: no-repeat;
            background-size: 100%;
        }
        &.star-48{
            .star-item{
                width: 20px;
                height: 20px;
                margin-right: 22px;
                &:last-child{
                    margin-right: 0;
                }
                &.on{
                    bg-image('star48_on');
                }
                &.half{
                    bg-image('star48_half');
                }
                &.off{
                    bg-image('star48_off');
                }
            }
        }
        &.star-36{
            .star-item{
                width: 15px;
                height: 15px;
                margin-right: 6px;
                &:last-child{
                    margin-right: 0;
                }
                &.on{
                    bg-image('star36_on');
                }
                &.half{
                    bg-image('star36_half');
                }
                &.off{
                    bg-image('star36_off');
                }
            }
        }
        &.star-24{
            .star-item{
                width: 10px;
                height: 10px;
                margin-right: 3px;
                &:last-child{
                    margin-right: 0;
                }
                &.on{
                    bg-image('star24_on');
                }
                &.half{
                    bg-image('star24_half');
                }
                &.off{
                    bg-image('star24_off');
                }
            }
        }
    }



</style>
























